The Collaborative International Dictionary of English v.0.48:

Odd \Odd\ ([o^]d), a. [Compar. Odder ([o^]d"[~e]r); superl.
   Oddest.] [OE. odde, fr. Icel. oddi a tongue of land, a
   triangle, an odd number (from the third or odd angle, or
   point, of a triangle), orig., a point, tip; akin to Icel.
   oddr point, point of a weapon, Sw. udda odd, udd point, Dan.
   od, AS. ord, OHG. ort, G. ort place (cf. E. point, for change
   of meaning).]
   1. Not paired with another, or remaining over after a
      pairing; without a mate; unmatched; single; as, an odd
      shoe; an odd glove.
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   2. Not divisible by 2 without a remainder; not capable of
      being evenly paired, one unit with another; as, 1, 3, 7,
      9, 11, etc., are odd numbers.
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            I hope good luck lies in odd numbers. --Shak.
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   3. Left over after a definite round number has been taken or
      mentioned; indefinitely, but not greatly, exceeding a
      specified number; extra.
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            Sixteen hundred and odd years after the earth was
            made, it was destroyed in a deluge.   --T. Burnet.
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            There are yet missing of your company
            Some few odd lads that you remember not. --Shak.
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   4. Remaining over; unconnected; detached; fragmentary; hence,
      occasional; inconsiderable; as, odd jobs; odd minutes; odd
      trifles.
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   5. Different from what is usual or common; unusual; singular;
      peculiar; unique; strange. "An odd action." --Shak. "An
      odd expression." --Thackeray.

   Syn: extraordinary; queer.
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              The odd man, to perform all things perfectly, is,
              in my poor opinion, Joannes Sturmius. --Ascham.
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              Patients have sometimes coveted odd things.
                                                  --Arbuthnot.
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              Locke's Essay would be a very odd book for a man
              to make himself master of, who would get a
              reputation by critical writings.    --Spectator.
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   Syn: Quaint; unmatched; singular; unusual; extraordinary;
        strange; queer; eccentric; whimsical; fantastical;
        droll; comical. See Quaint.
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WordNet (r) 3.0 (2006):

odd
    adj 1: not divisible by two [syn: odd, uneven] [ant: even]
    2: not easily explained; "it is odd that his name is never
       mentioned"
    3: an indefinite quantity more than that specified; "invited
       30-odd guests"
    4: beyond or deviating from the usual or expected; "a curious
       hybrid accent"; "her speech has a funny twang"; "they have
       some funny ideas about war"; "had an odd name"; "the peculiar
       aromatic odor of cloves"; "something definitely queer about
       this town"; "what a rum fellow"; "singular behavior" [syn:
       curious, funny, odd, peculiar, queer, rum,
       rummy, singular]
    5: of the remaining member of a pair, of socks e.g. [syn: odd,
       unmatched, unmated, unpaired]
    6: not used up; "leftover meatloaf"; "she had a little money
       left over so she went to a movie"; "some odd dollars left";
       "saved the remaining sandwiches for supper"; "unexpended
       provisions" [syn: leftover, left over(p), left(p),
       odd, remaining, unexpended]